package net;

import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class UdpEchoClient {
    private DatagramSocket socket=null;
    private String serveIP;
    private int servePort;

    public UdpEchoClient(String ip,int port) throws SocketException {
        serveIP=ip;
        servePort=port;
        socket=new DatagramSocket();
    }


    public void start() throws IOException {
        Scanner scanner=new Scanner(System.in);
        while (true){
            System.out.print("->");
            String request=scanner.nextLine();
            if(request.equals("exit")){
                System.out.println("good bye!");
                break;
            }
            DatagramPacket requestPacket=new DatagramPacket(request.getBytes(),request.getBytes().length, InetAddress.getByName(serveIP),servePort);
            socket.send(requestPacket);
            DatagramPacket responsePacket=new DatagramPacket(new byte[4096],4096);
            socket.receive(responsePacket);
            String response=new String(responsePacket.getData(),0,responsePacket.getLength());
            System.out.printf("req: %s; resp: %s\n",request,response);
        }
    }

    public static void main(String[] args) throws IOException {
        UdpEchoClient client=new UdpEchoClient("127.0.0.1",9090);
        client.start();
    }


}
